js delete 用法(删除对象属性及变量)

转自：https://www.jb51.net/article/54247.htm

1,对象属性删除

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function fun(){   this.name = 'mm';   }   var obj = new fun();   console.log(obj.name);//mm   delete obj.name;   console.log(obj.name); //undefined

2,变量删除

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var name = 'lily'; delete name; console.log(name); //lily

直接用delelte删除不了变量

3,删除不了原型链中的变量

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fun.prototype.age = 18; delete obj.age; console.log(obj.age) //18